Promoting the stability and adsorptive capacity of Fe₃O₄-embedded expanded graphite with an aminopropyltriethoxysilane–polydopamine coating for the removal of copper(ii) from water

Abstract

In this study, three magnetic graphites, namely, EGF, GAF, and GFA + KH550, were prepared, which were loaded either with Fe3O4 or with Fe3O4 and PDA or with Fe3O4, PDA, and KH550 onto expanded graphite.

Adsorption of Cr(Ⅵ) polluted water by Fe3O4@SiO2-APTMS nanocomposites prepared in the presence of ultrasonic irradiation for sustainable water resources utilization

“…In summary, the mechanism of Cr(Ⅵ) adsorption by Fe 3 O 4 @SiO 2 -APTMS was inferred as follows [58] , [59] , [60] , [61] , [62] : (1) —NH 2 that was on APTMS combined with H + in acidic environment to form —NH 3+ that adsorbed with Cr 2 O 7 2- in solution. (2) Cr(Ⅵ) reacted with the amino group on the surface of Fe 3 O 4 @SiO 2 -APTMS in the solution.…”